Handle vmservice messages while at breakpoint.

runtime/vm/json_stream.cc

Index: runtime/vm/json_stream.cc
===================================================================
--- runtime/vm/json_stream.cc	(revision 31232)
+++ runtime/vm/json_stream.cc	(working copy)
@@ -4,6 +4,7 @@
 
 #include "platform/assert.h"
 #include "vm/object.h"
+#include "vm/debugger.h"
 #include "vm/json_stream.h"
 
 
@@ -23,6 +24,16 @@
 }
 
 
+const char* JSONStream::LookupOption(const char* key) const {
+  for (int i = 0; i < num_options(); i++) {
+    if (!strcmp(key, option_keys_[i])) {
+      return option_values_[i];
+    }
+  }
+  return NULL;
+}
+
+
 void JSONStream::Clear() {
   buffer_.Clear();
   open_objects_ = 0;
@@ -122,6 +133,12 @@
 }
 
 
+void JSONStream::PrintValue(const SourceBreakpoint* bpt) {
+  PrintCommaIfNeeded();
+  bpt->PrintToJSONStream(this);
+}
+
+
 void JSONStream::PrintPropertyBool(const char* name, bool b) {
   PrintPropertyName(name);
   PrintValueBool(b);